Upload
molly-alison-robbins
View
214
Download
0
Embed Size (px)
DESCRIPTION
B factories have shown that a variety of measurements can be performed in the clean environment. By doing the work of extrapolating the existing measurements and the ones which will be possible with more statistics we observe that : - Several measurements are statistically limited and so it is worthwhile to collect >50ab -1 - The systematic errors are very rarely irreducible and can almost on all cases be controlled with control samples. On top of it detector improvements can be crucial for some analyses. B D D prim. sec ter. B events continuum events Thanks to better vertex resolution we can distinguish on vertex requirements B vs continuum events ( ~factor 5 background rejection) Not yet included in the extrapolations
Citation preview
Super Flavour FactoryPresentation of the Physics case Part
Paris 9 May 2007
444 pages
320 signers~80 institutions
M. Ciuchini, T. Gershon, A. Stocchi
The way we build the SuperB Physics Case :
Experimental reach. -Precision we could reach on different measurements. -New measurement possible ? - U(4S), U(5S) and charm at threshold.
Phenomenological impact. - SM - NP search + no loose theorem exists ? + MFV (mainly high tan) + MSSM - charm physics - tau physics LFV
People who contributed to the Physics Case chapter.D. Asner, R. Baldini-Ferroli, E. Baracchini, E. Ben Haim, A.Bevan, I.Bigi, M. Bona, M. Ciuchini, J. Dingfelder, P. Gambino, T. Gershon, K. George, T. Hurth, G. Isidori, V. Lubicz,, V. Lutz, P. Paradisi, M. Pierini, F. Renga, M. Roney, P. Roudeau, M.A. Sanchis-Lozano, L. Silvestrini, F. Simonetto, A. Stocchi,
Presentation in plenary Session by Marco Ciuchini
B factories have shown that a variety of measurements can be performed in the clean environment.
By doing the work of extrapolating the existing measurements and the ones which will be possible with more statistics we observe that :
- Several measurements are statistically limited and so it is worthwhile to collect >50ab-1
- The systematic errors are very rarely irreducible and can almost on all cases be controlled with control samples.
On top of it detector improvements can be crucial for some analyses.
B
D
Dprim.
sec
ter.
B events continuum events
Thanks to better vertex resolution we can distinguish on vertex requirements
B vs continuum events ( ~factor 5 background rejection)
Not yet included in the extrapolations
Experimental Reach
The angle
Based on the present “savoir faire”
0.678 0.026 0.002 0.021
t(ps) t(ps)
535MGolden B0 J/ K0
sin2 gives the best constraint on planeand the error can still be reduced
Example other modes : B0 D0 h0
0.56 0.23 0.050.23 0.16 0.04
SC
BabarSuperB will be able to make complementary measurements
(beyond J K0) that help to ensure that the theoretical uncertainties are under control and to control them on data
Important points : - We know how to perform these analyses- Very significant improvement from now2ab-1 Superb luminosity
SuperB
(talk of Catherine Goerge)
The angle
Isospin analyses performedat the B-factories
@ 100
Some very important measurementsstart to be possible only now with
about 0.5ab-1
0 0 6( ) (1.07 0.33 0.19) 103.5 evidence
Br B modes
consistent with no CP violation eff~90o (0/180)o
Important measurement because it givesthe contributions of Penguins diagram
Each of analysis will be allow to get (~2 degrees
It allow consistency checks and to control theoretical uncertainties on data
~1o
possible
SuperB
(*) theoretical limited
(talk of Adrian Bevan)
The angle
Many independent methods GLW, ADS, Dalitz, with many different decay channels
~1o
possible
(82 20)o
New D0 decays startingto be explored
(25 48)o
BaBar
Error vs DCP statistics
750pb-1
(4-5)o
20fb-1
(<1)o
Bondar Poluektov hep-ph/0510246
SuperB
The model error can be reducedby running at threshold
Best measurements from Dalitz analysis with D0Ks
1518
(92 41 10 13 ) BaBar(53 3 9 ) Belle
stat
ostat syst Dalitz
osyst Dalitz
(talk of Alex Bondar)
Many channels can be measured with S~(0.01-0.04)
sin2 from “s Penguins”…
SuperB
(*) theoretical limited
d d
sbW
B0d
t ss
K0
g
sb b s
~
~ ~
LRd
23
(talk of Catherine Goerge)
Exp. likelihood BABAR+BELLEBR(B → τ ν) = (1.31 ± 0.48)10-4
leptonic decay Bl
Br(B up to 3-4% (below limited by systematics)Br(B can be measured with the same precision not limited by syst.
Milestone :First leptonic decay seen on B meson
SuperB
(+) systematically limited
BR(B → τ ν) = (0.85 ± 0.13)10-4
SM expectation
First test can bedone, not yet precise
0 0B
Radiative B decays
- many measurements on Bs- measurements of Br on B- measurement of ACP on exclusive and inclusive modes
Significant improvement on bd ACP in inclusive decay at ~0.5% ! (SM~0.5%)
-Measurements of Br done-We start to perform AFB measur.
CP and FB asymetries in sll exclusive and inclusive decays at few per cent
(+) systematically limited (*) theoretically limited
SuperB
SuperB
Could the SuperB be a
Super Flavour Factory ?
Which is the interest ?
Charm physics at threshold
D decay form factor and decay constant @ 1% Dalitz structure useful for measurement
0.2 ab-1
Rare decays FCNC down to 10-8
Consider that running 1 month at threshold we will collect 500 times the stat. of CLEO-C
~1%, exclusive Vub ~ few % syst. error on from Dalitz Model <1o
D mixing
CP Violation in mixing should be now better addressed
String dynamics and CKM measurements
Charm physics using the charm produced at (4S)
Charm Physics
Better studied usingthe high statistics collected at (4S)
@threshold(4GeV)
@th
resh
old(
4GeV
)
HFAG preliminary
(talk of David Asner Ikaros Bigi )
*
Integrated quantities ASL and ACH at less than 0.5%Even a run at 1ab-1 will give less 1% error.
Run at the (5S) Possible with the same luminosity
BB from B*B produced in C=+1 after BB decay some sensitivity to S term in time integrated CP asym.
BdBdBd*Bd
Bd*Bd*
BsBsBs*Bs
Bs*Bs*
Bd,B+ produced with factor 6 less
than at (4S)
Dominated contribution
~95%
For more details see E. Baracchini et al. hep-ph/0703258
*
Bd(B+) and Bs are produced and can be separated
(talk of Francesco Renga)
In summary..
1) superb measurements related to tree level/ ~tree level (some depending upon LCQD calculations )
(DK), Vub /Vcb
2) superb measurements very sensitive to NP Physics sin(2) (Peng.)AFB (Xsl+l-), AFB (K*),
ACP (K*), ACP (s), ACP(s+d))
BK(*), LFV
3) several quantities depending upon LCQD calculations If Lattice QCD Calculations improve as the related experimental quantities, these measurements will be extremely powerfull
Br(B (,)
Br(B l), Br(BD)
4) <1% UT Fits for New Physics search (all the measurements mentioned before + others..)
5) charm measurements
6) Specific run at the (5S)
2 – 3%4 - 5%5.5 - 6.5%11%3 – 4%--------13%
0.5%(5% on 1-)
1.2%(13% on 1-)
2%(21% on 1-)
4%(40% on 1-)
B → D/D*lν
0.5 – 0.8 %(3-4% on ξ-1)
1.5 - 2 %(9-12% on ξ-1)
3%(18% on ξ-1)
5%(26% on ξ-1)ξ
1 – 1.5%3 - 4%4 - 5%13%1 – 1.5%2.5 - 4.0%3.5 - 4.5%14%fB
1%3%5%11%
0.1%(2.4% on 1-f+)
0.4%(10% on 1-f+)
0.7%(17% on 1-f+)
0.9%(22% on 1-f+)
1-10 PFlop Year
60 TFlop Year
6 TFlop Year
Current lattice error
Hadronic matrix
element
KB̂
Kπ+f (0)
1/2Bs Bsf B
Bπ+f ,...
B K*/ρ1T
Estimates of error for 2015
PhenomenologicalImpact
= 0.163 ± 0.028 = 0.344± 0.016
about 10 times better (not all measurements yet included…)
= ± 0.0028 = ± 0.0024
SuperB+Lattice improvements
In SMToday
The problem of particle physics today is : where is the NP scale ~ 0.5, 1…1016 TeV
The quantum stabilization of the Electroweak Scalesuggest that ~ 1 TeV LHC will search on this range
What happens if the NP scale is at 2-3..10 TeV…naturalness is not at loss yet…
Flavour Physics explore also this range
We want to perform flavour measurements such that : - if NP particles are discovered at LHC we are able
to study the flavour structure of the NPflavour structure of the NP- we can explore NP scaleNP scale beyond the LHC reach
f
bq
e f
Two crucial questions :
Can NP be flavour blind ?
Can we define a “worst case” scenario
No : NP couples to SM which violates flavour
Yes : the class of model with Minimal Flavour Violation (MFV),namely : no new sources of flavour and CP violationand so : NP contributions governed by SM Yukawa couplings.
Today(MFV) > 2.30 @95C.L.
NP masses >200GeV
SuperB(MFV) >~60 @95C.L.
NP masses >600GeV
As soon as you move from the worst case scenario…
Higgs-mediated NP in MFV at large tan
Similar formula in MSSM.
MH
(TeV
)
tan2ab-1
MH~0.4-0.8 TeVfor tan~30-60
SuperB
MH~1.2-2.5 TeVfor tan~30-60
BDlSimilar to B
Bl Excl. 2
In the red regions the are measured with a
significance >3 away from zero
23| |LR
1 10
g
sb b s
~
~ ~
New Physics contribution (2-3 families)
LRd
23
With the today precision we do
not have 3 exclusion
1
10-1
10-2
In this case the mainconstraints are bs
ACP(bs)
Today we would have magenta contour covering all the space
23Re d
LR
23Im d
LR
(TeV)gluinom
ACP magentaBr(sg) greenBr(sll) cyanAll constr. blue
MSSM+generic soft SUSY breaking terms
Flavour-changing NP effects in the squark propagator NP scale SUSY mass
flavour-violating coupling
Re (d13)LLvs Im (d
13)LL
with present disagreement
Constraint from md Constraint from sin2cos2
Constraint from sin2 All constraints
Re (d13)LLvs Im (d
13)LL
superB if disagreement disapper.
iAd j
Bd dijδ
AB
SM
Due to the actual disagreement between Vub and sin2 we see a slight hint of new physics
NP at high significance !
NP scale at 350 GeV
= 350 GeV
These evaluations do not agreewith those given in SuperKEKB :discussion undergoing
LVF and Littlest Higgs Model
LFV from CKM
107 BR
(
M 1
/2
SuperB
LFV from PMNS
SFF can perform many measurements at <1% level of precision
Precision on CKM parameters will be improved by more than a factor 10
NP will be studied (measuring the couplings) if discovered at LHC
if NP is not seen at the TeV by LHC, SFF is the way of exploring NP scales of the several TeV (in some scenario several (>10 )TeV..)
Summary
… and do not forget… SFF is also a Super-Super -charm factory…
Adjusting the central values so that they are all compatible
Keeping the central values as measured todaywith errors at the SuperB
BACKUPMATERIAL
Br ~ |Vub|2 in a limited space phase region…
Using Babar El, (Xs
El
Progress on Vub..
Inclusive : improving analyses and improving the control of the theory vs cuts
untagged analysisis the most precise
Exclusive : we start to have quite preciseanalysis of Br vs q2
Important that we measure at high q2 where LatticeQCD calculates better.
B l B Xu l
Confirming disagreement…
Precision measurements of |Vcb|
limiting factor F(1)
3.(41.93 0.65 0.07 0.67 )10
(4.564 0.076 0.003 )(1.105 0.116 0.005 )
(10.590 0.164 0.006 )%
s
s
s
s
cb fit theo
b fit
c fit
cl fit
Vm GeVm GeVBr
Inclusive Vcb still progress…
3
.(41.96 0.23 0.35 0.59 )10scb fit theoV
BaBar/CLEO/CDF/DELPHI Kinetic scheme
(1) cbF Vhere we extract :
BD*l
Essential point isto control /“measure”the effects of strong
interaction
Same for exclusive..
Study on charm sector help in the understanding of strong dynamics
(Babar)
Even
ts/0
.5
Rare decays : SuperB can cover all channels mentionned but Bs
Unless we perform a long run at the U5S
CP asymetries in radiative exclusive and inclusive decays
at a fraction of 1%
Bat 4%
CP and FB asymetries in sll exclusive and inclusive decays
at few per cent
Bat 5%
13% 2fb1Only bb back.Linear fit
Transv amplit. ??18% for 50ab-1 in Jeff
5 new free parameters Cs,s Bs mixing
Cd,d Bd mixing
CK K mixing
Today : fit possible with 10 contraints and 7 free parameters (Cd,d ,Cs,s, CK)
Con
stra
ints
Parametrizing NPphysics in F=2 processes
2 2 2
2
d
NP
q
SMi B B
SMB
C Q QeQ
F=2Fit in a NP model independent approach
0( / ) sin(2 2 )
| | | |
EXP SMd q d
CP d
EXP SMd
EXP SMK K
m C m
A J K
C
Cd d Cs s CK
D X
Vub/Vcb X
md X X
ACPJ
X
X
ASL X X
X X
ACH X X X X
ss X X
ms X
K X X
In future :
ACPJ
~X X
ASL(Bs) X X
DsK) X
Treeprocesses
13 family
23 family
12 familiy
No new physicsC=1 =0
Model Indep. Analysis in B=2
C = 1.24 ± 0.43 = (-3.0 ± 2.0)o
C = ± 0.031 = (± 0.5)o
2 2 2
2
d
NP
q
SMi B B
SMB
C Q QeQ
Bit more on Bs
C(Bs) ~ 0.026Bs) ~ 1.9o
Today at Superb
md magentaASL green cyanAll constr. blue
New Physics contribution (1-3 families)
1 10
1
10-1
(TeV)gluinom
|13
| LL
Example on how NP parameterscan be measured
Today SuperB
In the red regions the are measured with a
significance >3 away from zero
With the today precision we do
not have 3 exclusion
SuperB will probe up to >100 TeV for arbitrary flavour structure!
Let’s be more quantitative
How to read this table, two examples.
At the SuperB we can set a limit on the coupling at
2
350 ~ 201.8 10
GeV TeV
The natural coupling would be 1
we can test scale up to
21.8 10350
qmGeV
( )LL LL RR
( ~ )LL LL RR3
350 ~ 2701.3 10
GeV TeVwe can test scale up to
All this number are a factor ~10 better than the present ones